Based on
https://www.thingiverse.com/thing:10475
Remodelled it from scratch using FreeCAD so it wasn't too small.
Use a lot of perimeters while printing (I used 6).
You can find the FreeCAD file at https://www.thingiverse.com/thing:4262606
100% infill, use 6+ perimeters.
The author remixed this model.
Remodelled it from scratch using FreeCAD so it wasn't too small.